Typhlodromus porathi

Tsolakis, Haralabos & Ragusa, Salvatore, 2015, Considerations on systematics of the Phytoseiidae (Acari: Mesostigmata), with definition of a new species group and description of a new species, Zootaxa 3926 (2), pp. 229-243: 231-232

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Typhlodromus porathi


porathi  species group Tsolakis & Ragusa, species group nov.

Exemplar species— Typhlodromus (Anthoseius) porathi Swirski & Amitai, 1967: 53  .

Diagnosis. The six known species of this species group are of Palaearctic origin ( Fig. 1View FIGURE 1) and are grouped considering the characteristic shape of the insemination apparatus. Insemination apparatus with a free bulbous atrium; minor duct clearly visible in some species. Major duct at least 1.5 times the length of the calyx. The latter tubular, with a thin-walled section near the atrium and a thicker section with a double ring near the vesicle. All the species belonging to this group have the same dorsal and caudoventral setal patterns, 12 A: 8 A and JV:ZV, as most of the species belonging to the subgenus Anthoseius sensu Chant & McMurtry (1994)  . Dorsal setae subequal in length, except for Z 5, distinctly longer in some species, and J 5, always distinctly shorter. Dorsal shield reticulated, with five pairs of solenostomes (gd 2, gd 4, gd 6, gd 8 and gd 9). Apex of peritreme usually closer to base of j 1 than of j 3, except for Typhlodromus (A.) wainsteini Arutunjan  , closer to j 3.

Sternal shield smooth and lightly sclerotised; the posterior margin often indistinguishable. Extent of sternal shield variable, encompassing ST 1 -ST 3 (hoplochorous) in Typhlodromus (Anthoseius) porathi Swirski & Amitai  , Typhlodromus (Anthoseius) betulae Kolodochka  and Typhlodromus (Anthoseius) sandrae  n. sp., or encompassing only ST 1 and ST 2, with each ST 3 on a separate platelet (tylochorous) in T. (A.) wainsteini Abbasova  and Typhlodromus (Anthoseius) dactyliocalyx Stathakis, Papadoulis & Kapaxidi. Setae  ST 4 always each in a separate platelet. The insertions of ST 3 and ST 4 in Typhlodromus (Anthoseius) krimbasi Papadoulis & Emmanouel  are not clear. The ventrianal shield is subpentagonal, except in T. (A.) dactyliocalyx  where it is elongated; with four pairs of setae in addition to circumanal setae and a pair of evolved solenostomes (gv 3) in all species, except in the new species described here, in which it is in primitive condition.

Movable cheliceral digit bearing 1–6 teeth and fixed digit with 3–5 in addition to apical tooth of each digit. All but one species with spatulate macrosetae on genu, tibia and tarsus of leg IV.

Notes. There are two other clades in the rhenanus  species group sensu Chant & McMurtry (1994)  that share some apomorphies with the porathi  species group: the fleschneri  group, with Typhlodromus (Anthoseius) fleschneri Chant  , Typhlodromus (Anthoseius) terrulentis  van der Merwe, Typhlodromus (Anthoseius) rapidus Wainstein & Arutunjan  , Typhlodromus (Anthoseius) neobakeri Prasad  , Typhlodromus (Anthoseius) brisbanensis Schicha  , and the caudiglans  group, with Typhlodromus (Anthoseius) caudiglans Schuster  , Typhlodromus (Anthoseius) nodosus De Leon  , Typhlodromus (Anthoseius) orientalis Wu  , Typhlodromus (Anthoseius) marinus Wu & Liu  and Typhlodromus (Anthoseius) timidus Wainstein & Arutunjan. Both  of these groups share some external features with the porathi  species group (habitus of dorsal shield, spatulate macrosetae on leg IV, presence of the solenostome gv 3) but differ from it (and between themselves) in the different shape of the insemination apparatus. However, the definition of these taxa goes beyond of the aim of the present work.